1 files changed, 85 insertions, 0 deletions
diff --git a/backend/account/icon.go b/backend/account/icon.go
new file mode 100644
index 0000000..40632c6
--- /dev/null
+++ b/backend/account/icon.go
@@ -0,0 +1,85 @@
+package account
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"time"
+
+	"github.com/nsfisis/iosdc-japan-2024-albatross/backend/db"
+	"github.com/nsfisis/iosdc-japan-2024-albatross/backend/fortee"
+)
+
+func FetchIcon(
+	ctx context.Context,
+	q *db.Queries,
+	userID int,
+) error {
+	ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
+	defer cancel()
+
+	// Fetch user.
+	user, err := q.GetUserByID(ctx, int32(userID))
+	if err != nil {
+		return fmt.Errorf("failed to fetch user icon (uid=%d): %w", userID, err)
+	}
+	// Fetch user icon URL.
+	avatarURL, err := fortee.GetUserAvatarURL(ctx, user.Username)
+	if err != nil {
+		return fmt.Errorf("failed to fetch user icon (uid=%d): %w", userID, err)
+	}
+	// Download user icon file.
+	filePath := fmt.Sprintf("/files/%s/icon%s", url.PathEscape(user.Username), path.Ext(avatarURL))
+	if err := downloadFile(ctx, fortee.Endpoint+avatarURL, "/data"+filePath); err != nil {
+		return fmt.Errorf("failed to fetch user icon (uid=%d): %w", userID, err)
+	}
+	// Save user icon path.
+	if err := q.UpdateUserIconPath(ctx, db.UpdateUserIconPathParams{
+		UserID:   int32(userID),
+		IconPath: &filePath,
+	}); err != nil {
+		return fmt.Errorf("failed to fetch user icon (uid=%d): %w", userID, err)
+	}
+	return nil
+}
+
+func downloadFile(ctx context.Context, url string, filePath string) error {
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return fmt.Errorf("failed to download file (%s): %w", url, err)
+	}
+
+	client := &http.Client{}
+	res, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to download file (%s): %w", url, err)
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		return fmt.Errorf("failed to download file (%s): status %d", url, res.StatusCode)
+	}
+
+	fileDir := filepath.Dir(filePath)
+	if err := os.MkdirAll(fileDir, 0755); err != nil {
+		return fmt.Errorf("failed to create directory (%s): %w", fileDir, err)
+	}
+
+	file, err := os.Create(filePath)
+	if err != nil {
+		return fmt.Errorf("failed to open file (%s): %w", filePath, err)
+	}
+	defer file.Close()
+
+	_, err = io.Copy(file, res.Body)
+	if err != nil {
+		return fmt.Errorf("failed to save file (%s): %w", filePath, err)
+	}
+
+	return nil
+}